Lathe.



PATENTED MAY 3, 1904.

P. J. & R. H. GAHILL.

LATHE. APPLIOATION FILED MAY 19. 1903.

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PATENTED MAY 3, 1904.

P. J. 6: R. H. UAHILL.

LATHE.

APPLICATION FILED MAY 19, 1903.

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1 spring.

lUimTnn STATES Patented May 3, 1904.

PATENT Urrics.

PATRICK J. CAHILL AND RICHARD H. (JAHILL, OF LEEDS, MASSA- CHUSETTS.

LATHE.

SPEOIFICATIUN forming part of Letters Patent No. 759,074, dated May 3,1904. Application filed May 19, 1901i. Serial No. 157,752. (No model.)

To (all whom 21/; may concern:

Be it known that we, PATRICK J. (JAHILL and RICHARD H. (JAHrLncitizensof the United States of America, and residents of Leeds, in the countyof Hampshire and Stateof Massachusetts, have invented certain new anduseful Improvements in Lathes, of which the following is a full, clear,and exact description.

This invention relates to improvements in lathes for special work of thegeneral character shown and described in Letters Patent of the UnitedStates issued to P. J. Cahill September 27, 1887, No. 370,604, suchlathe being adapted for adjustment for receiving in the chuck thereofpieces or work of one size to be successively turned, finished, orotherwise operated on, and possessing capabilities for extremely quickopening and closing of the chuck for the removal of a finished piece andthe reception of a new piece, whereby the maximum amount of work may beperformed in a given time. In this character of lathe there is achuck-spindle surrounded by a rotatable sleeve, the spindle beingnormally stationary as regards any axial motion, while the sleeve islongitudinally movable back and forth on the spindle, has cooperativeaction with the spindle for the opening and closing movements of thechuck, and has combined therewith means for forcing the sleeve endwisefor opening the chuck while the reversed and closing endwise movement isunder the reaction of a sufficiently powerful spiral Inasmuch as thenormally stationary chuck-spindle is mounted in a bracket having asliding base at the end portion of the lathe opposite from that at whichthe chuck is located, which bracket may be adjusted longitudinally tochange the relations between the extremity of the spindle and thechuck-jaws, so that the endwise movements of the one relatively to theother will open and close the chuck within the proper range ofsuchmovements to accord with the work to be received and discharged, andinasmuch as the endwise movement of the sleeve for the opening of thechuck is repeatedly resisted by the upstanding member of theaforementioned bracket, which thrust thereagainst imposes considerableleverage against such bracket, it'has become very desirable to providenovel means and arrangements for the support of the bracket and theconfinement thereof immovably after adjustment in any of its requiredset positions, and means to this end constitutes one portion of thepresent invention.

The invention furthermore consists in constructions and combinations bfparts which will be hereinafter pointed out, and set forth in theclaims.

The improved lathe is illustrated in the accompanying drawings, in whichFigure 1 is a side elevation. Fig. 2 is a rear end view showing aportion of the lathe-bed extension, the adjustable bracket, and themeans for the confinement of the bracket immovably relatively to thelathe-bod extension. Fig. 3 is a plan view of the lathe-bed extensionwith some parts adjacent thereto in horizontal section. Fig. l is across-sectional view through one form of chuck which is used toadvantage on this lathe. Fig. 5 is in part a side elevation and in parta central longitudinalsection, on a larger scale, of the principalworking portions of the lathe. Fig. 6 is a vertical cross-sectional viewon lines 6 6, Fig. 5. Fig. 7 is a central view through portions of thelathe at the chuck-receiving end thereof.

Similar characters of reference indicate corresponding parts in all ofthe views.

1n the drawings, A represents the supporting structure, including thebed of the lathe, having the upstanding supports (6 a for the rotarychuck-carrying sleeve B and the chuckspindle (J, the sleeve beingslidable longitudinally through its journals (Z and having thedriving'pulleys l) thereon, as usual.

F represents the lathe-bed extension, the same comprising a base memberf, opposite upstanding side walls 9 1 having grooves or ways 72 itwithin their inner sides, and the vertical end member 2b which is boltedimmovably to one of the journal-eonstituting uprights a of the main bed.

G- represents the bracket in the upstanding member 7', of whichtheadjacent end of the chuck-spindle G has engagement and support insubstantially the manner shown in the aforementioned patent. 'iThe'base' kof the bracket G has the opposite edges thereof in engagement inthe aforementioned grooveways it /t of the lathe-bed extension. The baseof the said bracket Ghas 1ongitudinally ranging slots 10 1O verticallythrough it, and the adjacent portion of the lathe-bedextension hasvertical holes 12 12, through which holes and slots are passed theshanks of bolts on m, which receive nuts 13, constituting heads, insubstance, at their upper threaded extremities and which have eyes 14 atthe lower ends, portions of the bolts adjacent the eyes and which arebelow the lathe-bed extension extending through perforations therefor ina block or saddle n, which is fitted in a sufiiciently wide groove orrabbet therefor in the under side of the lathe-bed extension. The saidsaddle has a circular horizontal transverse bore or bearing therein fora cylindrical portion p of a shaft, which has endwise beyond suchcylindrical portion the eccentric cam portions q, closely encircled bythe eyes of the aforementioned bolts a, and the shaft is suitablyextended and has the operating-lever handle s. The bracket G beingclamped and confined on the lathe-bed extension by the devices justdescribed maintains the lathe-chuck spindle G always, until the bracketis moved longitudinally, in its invariable position relatively 1 to thesleeve B, which has the back-and-forth motion as imparted thereto by theyoke-ended lever M, which engages the groove-collar 7' of the sleeve,such lever being intermediately pivoted at 15 and having at its lowerextremity the connection therewith of one member, 16, of the toggle, theother toggle member, 17, being pivoted at 18 to a depending support 19,aifixed to the lathe-bed extension, and the lever 20 has pivotalconnection also at 22 with said support 19, and the link 23 is pivotedto the adj oined ends of the toggle and to an intermediate part of saidlever 20. The treadle-lever 28 is linked to the lever, and thismechanism has the counterbalancingweight 24 and sheave-guided cord inconnection therewith. The depression of the treadlelever 23 causes,through the connections mentioned, the forcing leftward of the collar0", which by having, in substance, an abutment against the nut t on theend of the sleeve moves the sleeve relatively to the chuck-spindle Cagainst and compressing the spiral spring H, such movement of the sleeverelatively to the spindle resulting in the opening of the chuck, theparts at the chuck end of the lathe being relatively formed and arrangedto this end, such formations and arrangements being various in differentcases, according to the type of chuck used. The depression of thetreadle-lever causing the opening of the chuck, the work may be insertedtherein or removed thereupon, and the release of the pressure on thetreadle-lever leaves the springHto react,

extent throw the chuck and work out of its proper position concentricwith the true axis of rotation; but the said bracket, which resists theimpact aforementioned, having its base marginally engaged in theopposite ways it and held firmly against undue change of positiondefeats the tendency, due to the leverage action against the upper partof the bracket stated, to throw the parts out of the positions ofrequired maintenance.

By changing the position of the chuck-spindle, moving it bodily endwisein either direction, the chuck will correspondingly be opened more orless each time the treadle-lever is operated, the range of its openingand closing movements being of course changed, and this is, asunderstood, readily performed by merely swinging the handle-lever s, sothat the eccen trics g 9 permit the clamping-bolts to unclamp the baseof the bracket, whereupon the turning of the handle-wheel a of thescrew-shaft o endwise moves the bracket Gr and chuckspindle C, thethreaded portion of the shaftscrew engaging through the suitably-tappedportion of the lathe-bed extension, while the hubs or collars o engageat opposite sides of the depending and perforated lug w of the bracket.

Inasmuch as the yoke-encircled collar 1' about the sleeve B isadvantageously non-rotatable and has its thrust inthe direction of theaxis against the adjacent end t, the faces of these parts are grooved toconstitute a raceway for the balls {0, which are interposed for theavoidance of friction, the chuck-spindle and sleeve usually beingrotatable in unison, although the spindle is not endwise movable duringthe time any run of work is being done in the lathe after the same hasbeen properly adjusted therefor.

In Fig. 1 a form of chuck is shown in which the chuck-head 30 hastapered internal ways or faces for the radially-movable chuck-jaws 32,the notched inner portions of the jaws engaging a flange of the spindle,while the cam action of the endwise-movable chuck-head imparts theopening and closing movements to the jaws. In this chuck the internalways radially formed within the annular chuck-bod y are constituted bythe suitably separated walls of segmental sections 40, fitted within theouter flaring and annular body or casing of the chuck, and inasmuch asthe jaws of the chuck may be accidentally struck in a manner to forcethem and the segments 40, rotationally displacing them, keys 42 areforced into grooves therefor in the adjoining walls of the chuck-bodyand the segments 40, said keys being held against loosening by setscrews43, all as shown in Fig. 4C.

In Fig. 5 a split chuck is shown, the same being attached at the end ofthe spindle O, having the exterior of its jaws tapered and coacted withby the flaring apertured annular member 35, carried as one with theendwisemovable sleeve.

In Fig. 7 the parts are shown as adapted for the reception,screw-engaged on the extremity or fitting at the end of the sleeve, ofwhat is understood as a blind chuck that is, one in which there is notnecessarily any expanding and contracting movements of thework-encircling portions of the chuck.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-- 1. In a device of the character described, thecombination of a main shaft, a sleeve loosely mounted on the shaft, achuck connected with the sleeve, a spring connected between the sleeveand shaft, a lever pivoted on the frame of the device and connected withthe sleeve at one end, toggle-joint members connected with the other endof said lever, and operating means arranged to operate the lever throughthe toggle members.

2. In adeviee of the character described, the combination of a mainshaft, a sleeve loosely mounted on the shaft, a chuck connected with thesleeve, a spring connected between the sleeve and shaft, a lever pivotedon the frame of the device and connected at one end with the sleeve, anintermediately-pivoted lever engaging said sleeve, a depending support,a second lever pivoted on said support, means for operating said latterlever, toggle members pivoted respectively to the support and to thefirst-mentioned lever, and a link pivotally connected with the togglemembers and with the said second lever.

3. In a device of the character described, the combination of a bedhaving an extension with upright side members that have grooves in theopposite walls, a bracket having an upright member, the base of thebracket being supported on the extension and engaging the same at itsgrooved portions, the bracket having longitudinal slots therein, a blocklocated beneath the extension, a spindle journaled in the block andhaving two cam portions, eyebolts journaled in the cams and extending upthrough the slots in the extension, heads on the bolts resting on theextension, a handle on the spindle, a screw journaled in the bracket andthreaded into the block, a main shaft having a thrust-bearing in thebracket, a sleeve loosely mounted on the shaft, a chuck member connectedwith the sleeve, a spring connected between the shaft and the sleeve, alever pivoted on the frame of the device and connected at one end withthe sleeve, togglejoint members connected with the other end of saidlever, and operating means arranged to actuate the lever through thetoggle members. Signed by us at Springfield, Massachusetts, in presenceof two subscribing witnesses.

PATRICK J. CAI-IILL. R. H. CAHILL.

Witnesses:

WM. S. BELLOWS, A. V. LEAHY.

